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#include "mmap.h"
#define ADDR(x) ((unsigned)&x - 0xc0000000 + 0x2000)
boot_info_t info __attribute__((section(".init")));
__attribute__((section(".multiboot.text"))) void
multiboot_strncpy(char *dest, const char *src, unsigned n)
{
for (unsigned i = 0; i < n && src[i] != '\0'; ++i) dest[i] = src[i];
}
__attribute__((section(".multiboot.text"))) void
multiboot2_module(struct multiboot_tag_module *tag, boot_info_t *tag_info)
{
tag_info->module_start = tag->mod_start;
tag_info->module_end = tag->mod_end;
multiboot_strncpy(tag_info->module_cmdline, tag->cmdline, 64);
}
/**
* parse multiboot2 structures
*/
__attribute__((section(".multiboot.text"))) void
__multiboot2(multiboot_uint32_t addr)
{
boot_info_t *__info = (boot_info_t *)ADDR(info);
struct multiboot_tag *tag;
for (tag = (struct multiboot_tag *)(addr + 8); tag->type != MULTIBOOT_TAG_TYPE_END;
tag = (struct multiboot_tag *)((multiboot_uint8_t *)tag + ((tag->size + 7u) & ~7u))) {
switch (tag->type) {
case MULTIBOOT_TAG_TYPE_CMDLINE:
multiboot_strncpy(__info->cmdline, ((struct multiboot_tag_string *)tag)->string, 64);
break;
case MULTIBOOT_TAG_TYPE_MODULE:
multiboot2_module((struct multiboot_tag_module *)tag, __info);
break;
case MULTIBOOT_TAG_TYPE_MMAP:
multiboot2_mmap(((struct multiboot_tag_mmap *)tag)->entries,
((struct multiboot_tag_mmap *)tag)->size / ((struct multiboot_tag_mmap *)tag)->entry_size,
__info->bitmap);
break;
default:
break;
} // switch
} // for
}
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